Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011
Deferred tax assets and liabilities
Stock-based compensation	$ 5,415	$ 6,420
Accrued expenses	1,065	933
Inventories	1,049	448
Depreciation and amortization	175	109
Other	354	2,073
Research and development credit carryforwards	3,204	3,446
Net operating loss carryforwards	45,203	38,944
Total deferred tax assets	56,465	52,373
Valuation allowance	(56,465)	(52,373)
Net deferred tax assets